A
FIELD experiment was carried out at El-Khattara region (Sharkia Governorate, Egypt) during 2009 season to study the effect of potassium (K) fertilization, gypsum (G) addition rates and foliar spraying with boron (B) and their combinations on growth, yield, yield components, oil quality as well as the uptake of some macro- and micronutrients by peanut (Arachis hypogaea L. cv. Giza 6) grown on sandy soil. Biological yield, as well as hay and seed yields, was increased significantly as a result of K and gypsum application, while it was insignificant increase under foliar spraying with B. The highest values of 18.5, 15.6 and 2.27 Mega gram (Mg) haā1 for biological, hay and seed yields were due to 50 kg K ha-1 + 1.2 Mg G ha1 without foliar spraying with B. For hay, the highest value of N-uptake was obtained when 50 kg K ha-1 + 2.4 Mg G ha-1 was obtained, while the highest values for P and K uptake (167 and 312 kg ha-1) were obtained when 50 kg K ha-1 + 1.2 Mg G ha-1 was applied under spraying with B. For seeds, the highest value of K uptake was obtained when 50 kg K ha-1 + 2.4 Mg G ha-1 was applied, while for N and P uptake the highest values (145 and 36.2 kg ha-1) were obtained when 50 kg K ha-1 + 1.2 Mg G ha-1 were applied under spraying with B. The oil yield of peanut seeds, using soxhlet extraction method, was found to be in a range of 231 and 352 g kg-1.The highest B uptake in the hay was obtained without spraying with B while in seeds it was obtained under spraying with B, where in both of them was obtained upon application of 50 kg K ha-1 + 1.2 Mg G ha-1. Apparent K recovery (AKR) and potassium use efficiency (KUE) were markedly decreased with increasing K addition rates.